Power-excavator.



lvm-881,695. PATENTED MAR. 1o, 1908. f P. EY KERSEY. 4

' POWER EXGAVATOR.

AIAPLIUATION FILED SEPT 25, 1907 struction as will hereinafter be ointed out. y

UNITED STATES PATENT OEiuOE. A

FRANOIS E. KERsEY, OF CINCINNATI, OHIO. i

POWER-EXCAVATOR.

speciaationof Letters Patent. Patented March 1o, 190s.

Application led September 25, 1907. Serial No. 394,445.

To allwhom it may concern.- .l

Beit known that I, FRANCIS E. KERSEY, a

citizen of-the United States, residing at Cin-l cinnati, inthe county of Hamilton and State .-5 of" Ohio, have invented certain new and useful Improvements in Power-Excavators, Aof which the following'is aspecification.

The object of my invention is to provide, in an excavator of the di per type, a means 1 10 for crowding the di per own to its work in.

suchmanner that t ere v-will be a simultaneous .crowding an'dlifting action.

A further object of my invention is to provide such improvements in details of con- The accompanying drawings i lustrate'my invention:

Figure 1 is a perspective view of an excavator embodying my'invention Fig. 2 a side elevation o`i another excavator embodying the same invention with somemodifications in detalls of construction and arrangement; Fig. 3 a detail ofthe dip er arm support, the

brake, and my improve means for crowding the dipper down td its work; Fig. 4 a section on line 4--4 ofFig. 3, and Fig. 5 a slight modiiication of the brake.

In the drawings, 10 indicates the usual turntable provided with a mast 11. Pivoted upon the turntable 10, is the vertically swinging boom 12 -which may have its pivot below the lane ofthe turntable, as shown'in Fig. 1, or a ove the planel of the turntable., as shown in Fig.l 2, the outer end of the'boom being supported in any desirable position by suitable cables 13. The dipper arm 14 is pro- 'vided at its lower end with any suitable form of di er 15, which is connected by a lifting taciiie comprising. chain 16, with a windlng drum 17 o erated in the usual well known manner. T e lower end ofthe dipper arm 14 is also connected by a cable 18 with a winding ldrum- 19 so that it maybe drawn downward and inward, in the usual Vwell known manner.

`The boom 12 isconveniently formed of v two parallel members 12 12 (see Fig. 4) betw'een which the dipper arm is projected and by which said dipper arm is held in the plane of the boom. The `dip er farm may also be conveniently formed o two parallel members 14 14 between which is arranged a pivot block 20 provided with suitable journal caring 21 by means of which the block is pivotally mounted upon shaft 22 journaled U-bolt- 27, as clearly in suitable bearin s 23 on the boom 12. Shaft 22 is rovide with a airv of pinions 24 (shown in otted lines in Flgs. 3and 4) each of-which meshes with a rack 25 secured tothe lower face of the upper end of each dipperarmfmember 14. mesh with their pinions by means of a plate 26 secured to theu per face of block 20 and extended over the 1 per arm members 14.

In order to hold the p ate 26 in place, and the bearing member 21 in position, I provide a shown in 3.

The racks are held in` cured to U-bolt 27 1s one end of a chain 28I y and this chain -is passed upwardly over an idler 29 journaled lat the inner upper end of the dipper arm 14, passing from thence downwardly beneath an idler 30 'ournaled in the boom '12, thence under an idler 31 also journaled in boom 12 near its inner lower` end, and thence between idlers 32 on the turntable (see Figs. 1 and 2)or over an idler 32 vjournaled in the turntable (see Fig. 3l to lrelease the brake, andarm 39 is connected bv a cable41 with a suitable o erating treadle 42.

In Fig. 5 a slight mod' cation of the brake is, shown in that the arm 37 of the rockshaft 3'8 is connected to the brake-band by means of av lever 43 instead of being directly j connected to one end of the brake band.

.In operation, the boom 12 is set at any'desired angle in the usual manner and, through cable 18, the di per is'drawn down to starting osition. so t at cable'16'will tend to draw dipper 15 upward against the dirt and at the same time drum 33 is manipulated .so as to draw upon chain 28 and this chain, acting upon the inner,upper end ofthe dipper arm 14, not `lonly servesto project it downward through the boom 1.2 but also operates in the same direction as cable 16, so as to keep the dipper to its work. The `crowding action of chain 28 maybe stop ed at any dipper arm then held against engthwise displacement, during further lifting by the cable oint and the rum 17 is then manipulated 16, by means ofthe brake bands 36, which,

operating upon wheels 35, serve to hold shaft 22 against rotationvso that thereafter the racks 25 of the dipper arm 14 will roll upon their pinions. Y By this construction I amv enabled to give to thedipper a crowding, digging'action which cannot be produced by j a mere longitudinal crowding movement of project the same longitudinally.

the dipper arm, as is the case in the ordinary type of construction wherein a small engine is mounted upon a boom and connected by suitable gearing with the dipper arm so'as to By my construction also the small engine heretofore commonly used on the boom'becomes unnecessary. The lever 42 is arranged near the drums v`1.7 19 and 33 so that the entire digdipper arm to project said dipper arm both longitudinally and angularly, the angular movement being in the direction to move upwardly the dipper end of the arm, said crowding meansv comprising a'slidino pivotal connection with the dipper arm an a cable running'therefrom over suitable sheaves to a windingv drum. f

2. In an excavator, the combination, with a supporting member, of a dipperarm mounted thereon, means for Ilifting the dipper end of said arm, a sliding pivotal support for said dipper arm, and a cable engaging-the opposite end of the dipper varm beyond the pivot in a direction tending to' project the dipper arm longitudinally 'and to swing` the dipper end of the arm upward.l

3. In an excavator, the combination, with a suitable support, of a dipper arm mounted thereon by a sliding pivotal connection, and a pulling-cable engaging the inner end of the dipper arm andl passing thence over a guide below the dipper arm ,and forward of the inner end thereof. Y

4. In an excavator, the combination, with a supporting member, of a dipper arm carried thereby and vlongitudinally movable with relationthereto, lifting mechanism for the outer end of the dipper arm, and a crowding means acting on the u per end of the dipper arm to project said ipper arm longitudinallyand angularly, the anffular movement being in Vthe direction of the lifting of the dipper end of the arm, and means for holding the dipper arm against longitudinal movement. y

5. In an excavator, the combination, with a supporting member, of a dipper arm mounted thereon, means for lifting the dip er end of said arm, a sliding pivotal support Vor said dip er arm, a cable engaging the opposite en of the dipper arm beyond the pivot in a direction tending to project the dipper arm" 7. In an excavator, the combination, with a supporting boom, of a shaft j ournaled thereon, a pinion carried by said shaft, a dipper `longitudinally and to swing therdip er end Y .of the arm upward, and means for iolding arm having ajasliding pivotal en agement with said shaft, a rack carried by t ie di iper arm and engaging with said pinion, lifting means for the dipper end of the arm, and means for engaging the inner end of the dipper arm to pull the same downward and forward.

8. In an excavator, the combination, with 'i a supporting boom, of a shaft journaled thereon,.a pinion carried by saidvshaft, a dipper arm having a sliding pivotal engagement with said shaft, a rack carried by the di )per arm and engaging with said pinion, lifting means for the dipper end of the'arm, and a' cable engaging the inner end of the dipper arm and passing thence over a guide below and forward of the inner end of the dippcr arm.

9. In an excavator, the combination, with a supporting boom, of a shaft j ournaled thereon, a pinion carried by saidshaft, a dipper arm having a sliding pivotal engagement with said shaft, a rackv carried by the dipper arm and engaging with said pinion, liftlng means for the dipper end of the arm, and a cable attached at-'one end to the pivotal support of the dipper arm, passing thence over an idler at 4the inner end of the dipper arm, thence downwardly and' fonvardly. and thence to suitable pulling mechanism. In witness whereof, I, have hereunto Set my hand and seal at Indianapolis, Indiana, this twenty-third day of September, A. D. one thousand nine hundred and seven.

FRANCIS E. KERSEY. [1.. s l

Witnesses: I

ARrHUR M. Hoon, THOMAS W. MCMEA'NS. 

